import 'styles/index.scss'
import 'styles/index.less'
import 'styles/index.css'
import React from 'react'
import ReactDOM from 'react-dom'
import App from './App.js'
new Promise(resolve=>{
    setTimeout(()=>{
        resolve("处理")
    },3000)
})

function isExist(arr,str){
    return arr.includes(str)
}

isExist([1,2,3],1)

ReactDOM.render(<App/>,document.getElementById('app'))